Sofia Martinez
Plastic waste is a pressing global issue, with 6.3 billion metric tonnes of the 8.3 billion metric tonnes of plastic produced since the 1950s having been thrown away. Plastic does not readily decompose or biodegrade, and traditional plastic can take anywhere from 20 to 500 years to break down, depending on the material and environmental factors such as sunlight exposure. However, a new type of biodegradable plastic has been developed, which could decompose much faster than existing plastics. So, which type of plastic decomposes faster?
| Characteristics | Values |
|---|---|
| Plastic type | Polyethylene terephthalate (PET) |
| Decomposition time | Up to 450 years |
| Decomposition process | Photodegradation |
| Breakdown agent | UV radiation from the sun |
| Biodegradability | Not readily biodegradable due to chemicals that bacteria cannot consume |
| Bioplastic alternative | Polyhydroxybutyrate (PHB) |
| Bioplastic decomposition time | 7 weeks |
| Biodegradable plastic decomposition time | 3 to 6 months |
| Recyclability | Yes, but only in specific facilities |
| Environmental impact | Pollution, harm to marine life |
| Other materials for comparison | Lumber (10-15 years), Cardboard (3 months to several years), Paper (2 to 6 weeks) |
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What You'll Learn
Biodegradable plastics can decompose in 3-6 months
Plastic is a versatile material that has improved our lives in many ways. However, it also poses a significant environmental challenge due to its persistence in the natural environment. Traditional plastics, such as PET (polyethylene terephthalate), are not readily biodegradable because their chemical composition is resistant to bacterial breakdown. As a result, plastic waste can persist for hundreds of years, leading to negative impacts on wildlife and marine life.
However, there is a type of plastic that offers a potential solution to this problem: biodegradable plastics, also known as bioplastics. These plastics stand out for their ability to biodegrade, despite not being derived directly from nature. Biodegradable plastics can be fully broken down by bacteria under specific conditions, typically within industrial composting facilities. This process usually takes only three to six months, as reported by BBC Science Focus, which is significantly faster than the hundreds of years required for traditional plastics to degrade.
The development of biodegradable plastics involves innovative approaches to their chemical composition. Scientists have created plant-based plastics using corn, sugarcane, or potatoes as the base material. In other cases, they have modified the chemical bonds of petroleum-based plastics to make them more susceptible to natural breakdown processes. These advancements have led to the creation of plastics like polyhydroxyalkanoate (PHA) and polylactic acid (PLA), which are specifically designed to break down naturally.
While biodegradable plastics offer environmental benefits, it is important to recognize that they are not without limitations. For instance, they may not completely break down to their natural form, sometimes leaving behind residues or toxic chemicals. Additionally, the infrastructure for recycling bioplastics is still developing, with only a limited number of specialized facilities capable of handling their composting and recycling requirements.
Despite these challenges, biodegradable plastics represent a step towards more sustainable materials. By reducing the time required for decomposition from hundreds of years to just a few months, these plastics can help mitigate the environmental impact of plastic waste. However, to fully realize the benefits of biodegradable plastics, further advancements in recycling infrastructure and the development of more eco-friendly degradation processes are necessary.
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Photodegradation breaks down plastic with UV light
Plastic is notoriously difficult to decompose. Traditional plastic, like PET (polyethylene terephthalate), cannot readily decompose or biodegrade because it is made with chemicals that bacteria cannot consume. However, this does not mean that plastic cannot break down at all.
Photodegradation is a type of decomposition that requires sunlight, not bacteria. When plastic is exposed to UV light, it can cause a chemical reaction, resulting in the scission, or severing, of the large polymer molecules. In other words, the UV rays break the bonds holding the long molecular chains together, turning a big piece of plastic into lots of little pieces.
The rate of photodegradation depends on the intensity of UV radiation. Shade, cloud cover, and geographic location all play a role in how much UV reaches the plastic. For example, plastic in landfills rarely sees the light of day, but plastic in the ocean is exposed to a lot of UV light. In 2009, researchers from Nihon University in Chiba, Japan, found that plastic in warm ocean water can degrade in as little as a year.
Photodegradation can be accelerated by exposing the plastic to more UV light. Landfills will sometimes expose plastic waste to the sun to accelerate the breakdown process. However, photodegradation in the ocean is particularly harmful to marine life, as the resulting microplastics are mistaken for food and ingested by marine animals.
Engineers can also make plastics that photodegrade more quickly by manipulating their molecular structure or integrating additives. Certain chemical additives can make plastics more light-sensitive, causing them to break down faster when exposed to UV light. Common additives include ketone carbonyl, carbon monoxide carbonyl, and different types of metal blends.
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Plastic-eating bacteria can break down plastic
Plastic is a substance that can take anywhere from 20 to 500 years to decompose, depending on the material and structure. This is because plastic is not a natural substance and does not readily decompose or biodegrade like organic material.
However, in 2008, Daniel Burd, a student at Waterloo Collegiate Institute, demonstrated that certain types of bacteria can break down plastic. His research earned the top prize at the Canada-wide Science Fair. Researchers have since confirmed Burd's findings and identified several other plastic-eating bacteria.
One such bacterium, discovered in a rubbish dump in the city of Sakai, Japan, was named Ideonella sakaiensis. This bacterium produces an enzyme that breaks down polyethylene terephthalate (PET), a common type of plastic found in clothing and packaging. Another example is the bacterium found in the gut of the lesser waxworm (Achroia grisella), which was found to be able to digest low-density polyethylene (PE).
While these discoveries offer hope for the future of plastic waste management, it is important to note that plastic-eating bacteria have limitations. For example, they can only break down specific types of plastic, and they digest plastic very slowly. Additionally, the process of using bacteria to break down plastic has yet to be effectively implemented in waste treatment plants.
Despite these challenges, researchers remain optimistic about the potential of plastic-eating bacteria to mitigate plastic pollution in nature. For instance, a French company named Carbios has been using a bacterial enzyme to process about 250kg of PET plastic waste every day, breaking it down into precursor molecules that can be used to create new plastic. This brings us closer to achieving infinitely recyclable plastic materials.
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Bioplastics are made from biological matter
Plastic is a material that can take anywhere from 20 to 500 years to decompose, depending on the material and structure. Traditional plastics like PET (polyethylene terephthalate) cannot readily decompose or biodegrade because they are made with chemicals that bacteria cannot consume.
Bioplastics, on the other hand, are made from renewable biomass sources, such as sugarcane and corn, or from microorganisms such as yeast. They are a family of materials with different properties and applications. If the plastic is resourced completely or significantly from a biological source, it can be considered a biobased bioplastic. These bioplastics can be either biodegradable or non-biodegradable.
Some scientists have created plant-based plastics using corn or sugarcane as a base material, while others have tweaked the chemical bonds of petroleum-based plastics to make it easier for nature to break them down. Bioplastics made from renewable resources can be naturally recycled by biological processes, thus limiting the use of fossil fuels and protecting the environment. They are also largely biodegradable and biocompatible.
Biodegradable bioplastics include polylactic acid (PLA), polyhydroxy alkanoate (PHA), polybutylene succinate (PBS), and starch blends. These biodegradable plastics can break down into carbon dioxide, water, and biomass under the right conditions. However, it's important to note that the label "biodegradable" can be misleading. While these plastics can break down into tiny pieces, similar to traditional plastics, they often require industrial composting facilities to fully decompose.
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Polyethylene terephthalate (PET) plastic takes 450 years to decompose
Plastic is a versatile material that has improved our lives, but it also poses a significant environmental challenge. Plastic does not decompose like organic materials, and the process of biodegradation does not apply to it. While wood, grass, and food scraps are transformed by bacteria in the soil into useful compounds, plastic waste is not consumed by bacteria.
Polyethylene terephthalate (PET) plastic is a commonly used synthetic polymer derived from fossil hydrocarbons. It is lightweight, durable, and inexpensive, making it ideal for single-use packaging materials. However, PET plastic is challenging to decompose naturally. Its chemical composition makes it resistant to biodegradation, as bacteria cannot consume it.
The long-term presence of PET plastic in the environment poses serious ecological, food safety, and human health risks. It is estimated that a PET plastic bottle can take up to 450 years to fully decompose in a landfill. This is because PET requires UV light from the sun to break down, rather than bacterial decomposition.
While PET plastic is challenging to decompose, it can be recycled mechanically or chemically. Mechanical recycling involves processing PET and polyethylenes into usable feedstock or fuel. Chemical recycling, such as glycolysis, has been successful in breaking down PET into its constituent monomers, which can then be reused or repurposed.
Additionally, there are ongoing innovations in biodegradable plastics, or bioplastics, which can be broken down by bacteria. These bioplastics can be plant-based, a combination of plant-based and fossil-fuel-based, or created through tweaking the chemical bonds of petroleum-based plastics. While biodegradable plastics offer an eco-friendly alternative, proper disposal methods, such as industrial composting, are still necessary to ensure complete decomposition.
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Frequently asked questions
Biodegradable plastics, or bioplastics, are designed to break down into natural compounds such as water, carbon dioxide, and biomass. Bioplastics made from polyhydroxyalkanoate (PHA) and polylactic acid (PLA) are known to be the fastest-biodegrading materials, with PLA decomposing in 47 to 90 days.
Biodegradable plastics are made from biological matter and can be broken down by bacteria into natural compounds. Bioplastics made from renewable materials such as PLA and PHA have molecules that degrade rapidly under the effect of certain enzymes found in nature.
Traditional plastics like PET (polyethylene terephthalate) are resistant to decomposition as they are made with chemicals that bacteria cannot consume. Plastic water bottles made from PET can take up to 450 years to decompose in landfills.
Photodegradation is a process that uses UV radiation from the sun to break down plastics. While this can be harmful to marine life, landfills often use sunlight to accelerate the breakdown of plastic waste.
